SCSK Corporation (株式会社SCSK, Kabushiki-gaisha Esu-Shī-Esu-Kei) is a Japanese information technology company headquartered in Tokyo, Japan, offering IT services and computer software. Outside of Japan, It is widely known for its acquisition of Sega in 1984, ended in the sale to Sammy in 2004, through which Sega Sammy Holdings was established.^[1]

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SCSK Corporation

Native name	株式会社SCSK
Romanized name	Kabushiki-gaisha Esu-Shī-Esu-Kei
Formerly	Sumitomo Computer Service Corporation (1969-2005) Sumitomo Computer System Corporation (2005-2011)
Company type	KK Subsidiary
Traded as	TYO: 9719
Industry	System integration Information security Computer software
Founded	1968
Founder	Isao Okawa
Headquarters	Tokyo, Japan
Revenue	¥323.9 billion
Total assets	¥21.1 billion
Number of employees	11,910 (2017)
Parent	Sumitomo Corporation
Subsidiaries	CRI Middleware
Website	www.scsk.jp

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In 1969, Sumitomo Computer Service Corporation was established by Sumitomo Corporation.^[2] In 2005, Sumitomo Computer Service Corporation and Sumitomo Electronics Corporation were merged into Sumitomo Computer System Corporation.

Separately, in 1968, CSK Corporation was established by Japanese entrepreneur Isao Okawa^[3] in 1968. The acronym CSK was derived from "Computer Service". CSK established CSK Research Institute, later renamed as CRI Middleware, in 1983. At its peak, the company, the largest independent software company in Japan until it being acquired, was called the CSK Group. In the 2000s, its real estate investment business failed, resulting in heavy losses to the company after Okawa's death in 2001.^{[4][clarification needed]}

In April 2011, Sumitomo Corporation acquired CSK through a takeover. In October 2011, Sumitomo Computer System Corporation and CSK Corporation went through a statutory merger, in which Sumitomo Computer System absorbed CSK Corporation and was re-branded SCSK Corporation.^[5]

The company offers the services of system integration, cloud computing, information security and produces computer software in Japan, mostly on a B2B basis for enterprises. SCSK Corporation's business type and scope is similar to those of Itochu Techno-Solutions, Uniadex and Mitsui Knowledge Industry, which also specialize in IT services. The company has been listed on the Tokyo Stock Exchange since 1989, then as Sumitomo Computer Service Corporation.^[6]

• List of companies of Japan